Rose plant--Carola

ABSTRACT

A rose plant exhibiting good resistance to powdery mildew, and being characterized by nonfragrant flowers, very high crop, good self-rooting and high stem break forth.

This application is a continuation application of application Ser. No. 07/387,837, filed Aug. 1, 1989, now abandoned.

FIELD OF THE INVENTION

The present invention is concerned with a new variety of hybrid tea rose discovered by me and being a mutation of Deladel (U.S. Plant. Pat. No. 4,391, dated Mar. 6, 1979), Madame G. Delbard variety.

SUMMARY OF THE INVENTION

The mutation was first discovered on a cultivated area, in a farm located in South America, at an altitude of about 2,400-2,500 meters above sea level, with average night temperature of 5-8 degrees centigrade, and day temperature of 5-18 degrees centigrade.

Plants were grown in a green-house, and then brought to Israel, where they were vegetatively propagated by selfrooting of cuttings.

Asexual reproduction of this new cultivar as performed at Yuval Agriculture Products at Moshav Ha'Yogev shows that the foregoing characteristics and distinctions came true to form and are established and transmitted through succeeding propagations.

The resulting plants were found to be stable in their botanical characteristics, as are described below and in the attached drawing.

The following is a description of the characteristics of my new rose cultivar which distinguish it from cultivars of which I am aware and especially from Madame G. Delbard (Deladel):

1. Better branching.

2. Larger flower bud.

3. Distinct larger number of petals.

4. Larger sepals with larger extensions.

5. More water shoots, than the original plant.

6. Good grafting compatibility on Rosa indica L.

BRIEF DESCRIPTION OF THE DRAWING

The first sheet of the drawing depicts buds of the claimed plant in various stages of opening; the characteristic shape and foliaceous appendages of the sepals are shown along with the high-centered character of the buds themselves. The coloration of the other surfaces of the petals at this stage of opening is also depicted.

The second sheet of drawing shows, in comparison, two petals of Carola, designated as A at the top of the drawing, and petals of comparable stage of maturity as taken from the parent variety "Deladel", labelled B, at the bottom of the drawing. This sheet of drawing also depicts the typical difference in size of the petals taken from the mutation as compared to the parent variety; and, also shows the difference in the size of the spot at the point of petal attachment; that of the parent "Deladel" being much smaller in the comparison; and the difference in coloration; that of the sport being clear white while that of the parent being light yellow in color.

DETAILED DESCRIPTION OF THE INVENTION

The following is a detailed description of my new rose cultivar with color in terminology in accordance with Royal Horticultural Society of London, England (R.H.S.) Colour Chart except where ordinary dictionary significance of color is indicated.

The plant originated from a mutation of Madame G. Delbard.

The following description is based on observations made in Moshav Ha'Yogev, Israel, in a greenhouse:

    ______________________________________                                         Plant      growth habit   upright                                              Older stem                corky.sup.1                                          Young shoot                                                                               anthocyanin    strong                                                          coloration                                                                     hue of anthocyanin                                                                            purple                                                          coloration                                                          Prickles                  present                                              Prickle    shape of upper straight                                                        sides                                                                          shape of lower side                                                                           concave                                              Short prickles                                                                            number         few                                                  Long prickles                                                                             number         few                                                  Leaf       size           length 140-170 mm                                                              width 110-150 mm                                                green color    medium to dark                                                  glossiness of upper                                                                           absent or very weak                                             side                                                                Leaflet    cross section  slightly convex                                                 undulation of  absent or very weak                                             margin                                                              Terminal leaflet                                                                          length of blade                                                                               ca. 60 mm                                                       maximum width  ca. 35 mm                                                       length of petiole                                                                             ca. 20 mm                                                       shape of base  rounded                                              Flowering shoot                                                                           number of flowers                                                                             few                                                  Flowering habit           continuous                                           Flower pedicel                                                                            number of hairs or                                                                            few                                                             prickles                                                            Flower bud longitudinal   circular to ovoid                                               section                                                             Flower     type           double                                                          number of petals                                                                              33-40                                                           diameter       ca. 110 mm                                                      view from above                                                                               rounded to star-                                                               shaped                                                          side view of upper                                                                            flattened-convex                                                part                                                                           side view of lower                                                                            flat                                                            part                                                                           fragrance      none                                                 Sepal      length         40-55 mm                                                        extensions     strong                                               Petal      size           length 50-60 mm                                                                width 55-65 mm                                                  shape          rounded                                                         color of middle                                                                               RHS 53-A dark red                                               zone of inner side                                                             (according to the                                                              Royal Horticultural                                                            Society Color                                                                  Chart)                                                                         color of marginal                                                                             RHS 53-A dark red                                               zone of inner side                                                             spot at base of                                                                               present                                                         inner side                                                                     size of spot at                                                                               medium (length of                                               base of inner side                                                                            spot on the upper                                                              side of the petal                                                              was 8-10 mm                                                     color of spot at                                                                              white (RHS 155-D)                                               base of inner side                                                             color of middle                                                                               RHS 53-C dark red                                               zone of outer side                                                             color of marginal                                                                             RHS 53-C dark red                                               zone of outer side                                                             spot of base of                                                                               present                                                         outer side                                                                     size of spot at                                                                               very small to small                                             base of outer side                                                             color of spot at                                                                              white                                                           base of outer side                                                             reflexing of margin                                                                           strong                                                          undulation of  weak                                                            margin                                                              Stamen     predominant color                                                                             purple                                                          of filament                                                                    length         long                                                            predominant color                                                                             purple                                                          hairiness of upper                                                                            medium                                                          half                                                                           position as    above                                                           compared with                                                                  anthers                                                                        size           medium                                                          shape of       pitcher shaped                                                  longitudinal                                                                   section                                                             ______________________________________                                          .sup.1 Typical for hybrid tea roses.                                     

The time of beginning of flowering is early.

The average number of petals per flower: 33-38.

The bud size at time of picking is 5-6 cm long, and 3 cm in diameter.

The number of side shoots per flowering branch is 5-6.

The annual produce is 150-160 flowers per square meter.

Flowering stem medium green, 70-80 cm long with an average of 13 leaves.

The vase life is up to 15 days, under condition of room temperature.

Average number of water shoots, in 1st year after planting 4-6.

Prickles, per internode -- 2-3.

Prickles up to 3rd leaf -- 1.

Number of leaflets per leaf -- 5-7.

Budding sprout -- 8-9.

Fragrance -- none.

Plant's height in 8 months after planting 170-180 cm.

Time from planting to commercial flower production 6-8 months.

Good resistance to Rose Powdery Mildew.

Exhibits high stem break forth, very high crop and good self-rooting.

Under condition of room temperature flower opening proceeds

Under condition of room temperature flower opening proceeds slowly.

The variety should be grown under glass.

Comparison Of Production Characteristics Between The New Variety "Carola" and Variety "Deladel"

Observations made in Ecuador from commercial plantings during 1988-1990, where the two varieties were grown side by side, under the same conditions and same age, were both self-rooted and with the same planting time. Each one 10,000 square meters of plants.

    ______________________________________                                                         Carola   Deladel                                               ______________________________________                                         Average number of petals                                                                         33-38      18-25                                             Average number of cut flowers                                                                    1.85-2.00  0.90-1.25                                         per plant per month (year                                                      round production)                                                              Average number of water-                                                                         4-6        2-3                                               shoots in first year after                                                     planting                                                                       Plant height in 8 months                                                                         170-180 cm 80-90 cm                                          after planting                                                                 Size of spot at base of inner                                                                    medium     very small                                        side                                                                           Color of spot at base of                                                                         white      yellow                                            inner side of petal                                                                              (RHS 155-D)                                                  Fragrance of flower                                                                              none       slight, not                                                                    sweet or spicy                                    Time from planting to                                                                            6-8 months 10-12 months                                      commercial flower production                                                   Grafting compatibility on                                                                        very good  very poor                                         Rosa indicia L.   (about 65%                                                                     success)                                                     ______________________________________                                    

The size of the spot was, for the variety `Carola` defined

as: size of spot at base of inner side of petal-medium, and size of spot at base of outer side of petal-very small to small, using the sketch of the Test Guidelines for Rose of the Union for Protection of New Plant Varieties (document TG/11/4)-applying the following calculation:

    [1+{(average length of spot/average length of petal)-1}]/(35-1)*8

With lower value of length of spot 1 mm, and higher value of length of spot 35 mm.

Statistical Analysis For Additional Observations Made In Ecuador In Order To Compare Carola With Deladel

    ______________________________________                                                          Carola                                                                               Deladel                                                 ______________________________________                                         Number of petals:                                                              standard deviation 7.77    3.92                                                mean               32.05   22.35                                               Plant height in 8 months:                                                      standard deviation 0.13    0.10                                                mean               1.97    1.50                                                Basal shoots:                                                                  standard deviation 1.48    0.67                                                mean               3.00    1.32                                                Flowers per plant:                                                             standard deviation 0.53    0.48                                                mean               1.76    1.17                                                ______________________________________                                    

In all tests of the examined characteristics, the conclusion was that the population differ with a high level of significance.

Comparison Of Production Characteristics Between The New Variety Odem And Variety Carola

The new variety Odem is a variety that was subsequently discovered and is a spot of Carola. They differ as described below:

    ______________________________________                                                         Odem      Carola                                               ______________________________________                                         Average number of petals                                                                         39-48       33-38                                            Size of petal                                                                  length            37-45 mm    50-60 mm                                         width             39-49 mm    55-60 mm                                         Flower                                                                         diameter          ca. 80 mm   ca. 100 mm                                       color of upper side                                                                              RHS 46-AB   RHS 53-A                                         Petal's reflexing medium      strong                                           Size of spot at base of inner                                                                    small       medium                                           side of petal                                                                  Color of spot at base of inner                                                                   yellow      white                                            side                                                                           Length of flowering stem                                                                         50-70 cm    70-90 cm                                         Thickness of flowering stem                                                                      medium      thick                                            Number of flowering stems per                                                                    about double                                                 plant per year    as for                                                                         Carola                                                       ______________________________________                                     

I claim:
 1. A new and distinct variety of rose plant of a hybrid tea rose, variety, named Carola, as shown and described, and consisting mainly of plants being vigorous growing, showing a large flower bud, containing a large number of petals, having nonfragrant with petals with a medium-sized white spot at their base, with early and prolific flower production, and having fast and good propagating features. 